Foreign relations -- Politics and government -- 7 History -- 4 World politics -- 4 National security -- 3 World War, 1914-1918 -- 3 National socialism -- 2 more ... Psychological aspect 2 Public opinion -- 2 Strategic aspects 2 Unification, 1990 2 American -- 1 Attitudes -- 1 Civilization 1 Cold War 1 Congresses -- 1 Defenses 1 Economic conditions -- 1 Federal government -- 1 Foreign public opinion -- 1 Geopolitics -- 1 Germany -- 1 Great powers 1 Heads of state -- 1 Historiography -- 1 History. -- 1 Influence 1 International cooperation 1 Intervention (Internation al law) 1 Iraq War, 2003-2011 -- 1 less ...